Evaluation of movement of the disc with temporomandibular joint dysfunction using fast-scan MR imaging. Part I: Fast-scan MR imaging of the temporomandibular joint.:Part I: Fast-scan MR imaging of the temporomandibular joint

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This study was conducted to evaluate the movement of a disc with temprormandibular joint (TMJ) dysfunction. In this paper, fast-scan MR images were compared with spin echo images in TMJs at static closed and maximally opened mouth, and characteristic of fast-scan MR imaging was examined during incremental mouth opening and closing. The subjects wered of 8 patients (2 males and 6 females) with TMJ dysfunction, and their age ranged from 19 to 35 years with a mean age of 25.9 years. Of these 8 patients, 7 had unilateral 1 bilateral and TMJ dysfunction. Sixteen TMJs of 8 patients was imaged by a whole-body MR imager (SIGNA, GE Medical System) operating at 1.5 Tesla with a dual 3 inch receiver coil. To increase contrast, the on-resonance binomial magnetization transfer contrast (MTC) pulse was applied to gradient recalled acquistion in a steady state (GRASS) in fast-scan MR imaging. A series of sequential images were obtained with opening and closing mouth, using an opening device. The fast-scan MR images had not high resolution in appearance of discs and condyles in some TMJs compared with spin echo images. However, in movie mode the pertinent joint structures such as disc, condyle, posterior band, and masticatory muscles were clearly delineated. The fast-scan images demonstrated two directions of deformity of disc associated with incrementally opening mouth in the patients with anterior disc displacement.
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